CN116148360A - Ultrasonic water immersion flaw detection and defect positioning method - Google Patents
Ultrasonic water immersion flaw detection and defect positioning method Download PDFInfo
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
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Abstract
The invention discloses a method for ultrasonic water immersion flaw detection and defect positioning, which comprises the following steps: s1, preparing a sample to be detected; s2, providing a standard sample block; s3, manufacturing a TCG curve; s4, scanning the sample; s5, identifying defects in the sample; s6, positioning defects in the sample. The ultrasonic water immersion flaw detection and defect positioning method can truly reflect the distribution, quantity, indication size, position and the like of the defects in the sample, can accurately mark the defects on the sample, and realizes targeted anatomical analysis.
Description
Technical Field
The invention belongs to the technical field of ultrasonic flaw detection, and particularly relates to a method for ultrasonic water immersion flaw detection and defect positioning.
Background
With the continuous improvement of the technological level, the quality requirements on steel materials are higher and higher, and the quantity, the shape and the distribution of inclusions in the steel are required to be strictly controlled. The ultrasonic water immersion flaw detector can be used for detecting macroscopic inclusions of steel products and evaluating the purity, has the capability of rapidly and accurately evaluating the purity, and provides a basis for removing large-size inclusions and improving the purity.
The water immersion ultrasonic flaw detection method is to immerse the probe and the sample in water, and uses water as the coupling agent for flaw detection, and the ultrasonic wave emitted by the probe is transmitted to the sample through water to perform flaw detection, and when a certain equivalent of flaw is encountered, a certain amplitude of flaw echo occurs. The water immersion ultrasonic flaw detection can eliminate factors which are difficult to control in direct contact detection, so that the sound wave emission and the sound wave receiving are stable, the probe is not easy to wear, the coupling is stable, large-size inclusions which are not easy to detect by the traditional means can be found, the detection rate is high, the stability is good, the detection result can intuitively reflect the distribution, the quantity, the indication size, the position and the like of defects in steel, and the method is the most effective method for realizing the rapid evaluation of purity at present. According to the position information detection data provided by ultrasonic water immersion flaw detection, a product sample can be further positioned and dissected, and components and characteristics of defects, particularly large-size inclusions, are analyzed by combining a scanning electron microscope and an energy spectrometer, so that a more reliable basis is provided for researching the formation mechanism of the defects, and a direction is provided for improving the purity of high-quality bearing steel. However, in the current ultrasonic water immersion detection process, accurate positioning and dissection of defects in a sample are difficult to realize according to position information provided by scanning.
At present, the defects of the ultrasonic water immersion flaw detection positioning sample mainly comprise the following defects: 1) The positioning mode is as follows: the probe is moved to the upper part of the defect and is connected to the surface of the sample through the vertical bridge of the ruler, and defect marking is carried out on the surface of the sample, but the probe is difficult to position to the center of the probe, so that the error is increased; 2) Marking mode: marking the defect position of the sample in water, so that the marking difficulty is high and the accuracy is low; 3) After the sample is taken out from the water, the system coordinate system cannot be corresponding to the sample, if the defect position needs to be confirmed, the position can only be detected again, the inspection efficiency is seriously reduced, and the labor, time and the like are consumed; 4) Because the defect size is small, the defect can not be found when the anatomical analysis is performed due to inaccurate positioning, and the working difficulty is increased.
Patent document with the authority of publication number CN112326793B discloses a mechanical arm backtracking movement method based on ultrasonic C-scan projection view defect relocation, which can control the mechanical arm to backtrack to a located defect position in an optimal path.
The patent document with publication number of CN114755300A discloses a defect positioning quantitative detection method based on ultrasonic nondestructive detection, which can acquire the defect size based on the data of straight line B scanning, draw the defect morphology in a coordinate system, has visual output result, has simple detection method, does not need a signal processing method to perform characteristic enhancement on a defect echo signal, and only needs to adopt a reference signal in a defect-free area and subtract the reference signal from the original signal of B scanning.
The patent document with publication number of CN111610256A discloses a method for detecting the blind area defect of the surface of a bar by using an ultrasonic water immersion flaw detection system, wherein the method can detect the blind area with the diameter of more than 50mm and within 1-8mm of the near surface of the bar, the detection sensitivity can reach a flat bottom hole with the diameter of 0.2mm, and the distribution condition of the full-section defect of the bar with the diameter of more than 50mm can be estimated by adding the detection result of the conventional high-frequency ultrasonic C scanning water immersion flaw detection system.
In summary, the defect location of the current water immersion ultrasonic flaw detection mainly characterizes the defect position through scanning a map, and does not establish a precise position corresponding relation between the defects in the sample and the detection results, thereby increasing the difficulty of the later anatomical analysis of the defects.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a method for ultrasonic water immersion flaw detection and defect positioning, and aims to realize accurate positioning and targeted anatomical analysis of defects on a sample.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the ultrasonic water immersion flaw detection and defect positioning method comprises the following steps:
s1, preparing a sample to be detected;
s2, providing a standard sample block;
s3, manufacturing a TCG curve;
s4, scanning the sample;
s5, identifying defects in the sample;
s6, positioning defects in the sample.
In the step S1, the sample is a cylinder, the surface of the sample is processed after heat treatment, the roughness of the sample is not more than 1.0 mu m, the grain size of the sample is better than grade 8, and the surface processing amount of the sample is not more than 5% d.
In the step S1, the detection start end of the sample is marked with a start position, including a start angle, a rotation direction, and a sample zero point position defect point O.
In the step S3, a standard DAC detection curve is first fabricated according to the standard sample block, and then the flat bottom Kong Fuzhi at different depths is compensated to 80% by depth compensation, so as to fabricate an ultrasonic depth compensation curve, i.e. a TCG curve.
In the step S4, the start and end positions of the system scanning are set, the point O of the defect point of the zero point position of the sample is placed in the scanning range of the system, and the scanning key parameters are set.
The scanning key parameters comprise a stepping distance, a stepping speed and a pulse repetition frequency; the step distance is more than or equal to 1/2L min ，L min Step pitch = scan pitch, which is the length of the smallest defect; the stepping speed is less than or equal to 100mm/s, and the stepping speed=scanning speed; pulse repetition frequency P RF = (scan speed/scan pitch) ×n, N is a positive integer.
In the step S5, the sound beam is focused to a defect point inside the detected sample, and the distance between the probe surface and the workpiece incident surface is set: d, d wp ＝F l -c tp /c 0 *d f Wherein d wp F is the distance between the probe surface and the sample incident surface l C is the nominal focal length of the probe tp C is the sound velocity of the detected sample 0 Is the sound velocity of longitudinal wave in water, d f To focus the distance of the target from the surface of the sample to be inspected.
In the step S6, corresponding coordinates of a sample zero point position defect point O and a sample internal defect point in the ultrasonic water immersion C scanning detection system are determined, the position of the sample internal defect point relative to the sample zero point position defect point O is calculated, the defect position is marked by using a defect positioning ruler, and then the sample is dissected and subjected to subsequent defect analysis by wire cutting.
The defect positioning ruler comprises an angle measuring ruler, an X-axis positioning ruler, a diameter measuring ruler arranged on the angle measuring ruler, a sliding block arranged on the diameter measuring ruler and a depth measuring ruler arranged on the sliding block, wherein the length direction of the X-axis positioning ruler is perpendicular to the length direction of the diameter measuring ruler.
The defect positioning ruler further comprises a first adjusting knob for fixing the diameter measuring ruler on the angle measuring ruler and a second adjusting knob for fixing the depth measuring ruler on the diameter measuring ruler.
The ultrasonic water immersion flaw detection and defect positioning method can truly reflect the distribution, quantity, indication size, position and the like of the defects in the sample, can accurately mark the defects on the sample, and realizes targeted anatomical analysis.
Drawings
The present specification includes the following drawings, the contents of which are respectively:
FIG. 1 is a flow chart of a method of ultrasonic water immersion inspection and defect localization of the present invention;
FIG. 2 is a grain size diagram of a sample to be tested;
FIG. 3 is a plot of a standard sample DAC having a diameter of 80mm flat bottom hole of 0.5 mm;
FIG. 4 is a graph of TCG for a standard sample having a diameter of 0.5mm for a flat bottom hole having a diameter of 80 mm;
FIG. 5 is a schematic diagram of a C-scan process;
FIG. 6 is a graph of sample scan results;
FIG. 7 is an amplitude versus position plot at points A and B of a defect inside a sample;
FIG. 8 is a schematic view of the structure of the defect localization ruler;
FIG. 9 is an anatomic golden phase diagram of defect points A and B;
marked in the figure as: 1. a sample to be detected; 2. a sample zero point position defect point O point; 3. an X-axis positioning ruler; 4. a diameter measuring scale; 5. an angle measuring ruler; 6. a depth measuring ruler; 7. a first adjustment knob; 8. and a second adjusting knob.
Detailed Description
The following detailed description of the embodiments of the invention, given by way of example only, is presented in the accompanying drawings to aid those skilled in the art in a more complete, accurate and thorough understanding of the inventive concepts and aspects of the invention, and to facilitate their practice.
It should be noted that, in the following embodiments, the "first" and "second" do not represent an absolute distinction between structures and/or functions, and do not represent a sequential order of execution, but are merely for convenience of description.
As shown in FIG. 1, the invention provides a high-precision and easy-to-use ultrasonic water immersion flaw detection and defect positioning method, which comprises the following steps:
s1, preparing a sample to be detected;
s2, providing a standard sample block;
s3, manufacturing a TCG curve;
s4, scanning the sample;
s5, identifying defects in the sample;
s6, positioning defects in the sample.
Specifically, in the step S1, the sample is a cylindrical body, the sample is a bar-shaped steel, the sample is subjected to surface treatment after heat treatment, the roughness of the sample is not more than 1.0 μm, the grain size of the sample is better than that of the 8-stage sample, and the surface treatment amount of the sample is not more than 5% d (d is the sample diameter).
In the step S1, the detection start end of the sample is marked with a start position, including a start angle, a rotation direction, and a sample zero point defect point O, which is artificially created.
In the step S2, the diameter of the flat bottom hole of the prepared standard sample block is set to be 0.3-0.8mm, the smaller the size of the flat bottom hole is, the higher the scanning precision is, the smaller the identifiable defect size is, but the too small size of the flat bottom hole causes high processing difficulty of the sample, the size of the flat bottom hole can be controlled to be 0.3-0.8mm, and the flat bottom hole size of the same standard sample must be kept consistent. The standard sample block at least comprises 6 flat bottom holes with different burial depths. The distance between the two flat bottom holes is more than twice the diameter of the probe wafer, and the bottoms of the flat bottom holes are prevented from being at the same height with the adjacent platforms. The echo of the flat bottom hole is clearly distinguished from the bottom wave, and the distance from the bottom surface is at least 2mm. In order to scan the surface defect of the sample as much as possible, the blind area range is reduced, the bottom of the flat bottom hole on the standard sample block is within 5mm from the surface position, and the surface roughness of the standard sample block is less than 1.0 mu m. The standard sample block has the same acoustic performance as the tested sample, and the diameter of the tested sample is the same or similar to that of the tested sample, and the diameter of the tested sample should not exceed the diameter of the comparison sample by +/-10%.
Preferably, in the above step S2, the flat bottom hole diameter of the prepared standard block is 0.5mm.
In the step S3, a standard distance-amplitude curve is first manufactured according to the standard sample block, that is, a standard DAC detection curve is manufactured, and then, by depth compensation, flat bottoms Kong Fuzhi at different depths are compensated to 80%, and an ultrasonic depth compensation curve is manufactured, that is, a TCG curve.
In the step S4, in the ultrasonic water immersion C-scan detection system, the system scanning start and end positions are set, the sample zero point position defect point O point is placed in the system scanning range, and the scanning key parameters are set.
In the step S4, the scanning key parameters include a step pitch, a step speed and a pulse repetition frequency; the step distance is more than or equal to 1/2L min ，L min Step pitch = scan pitch, which is the length of the smallest defect; step speed is less than or equal to 100mm/s, and step speed = scanning speedA degree; pulse repetition frequency P RF = (scanning speed/scanning pitch) ×n, N is not less than 1 and N is a positive integer.
In step S4, the gain amplification factor is increased to 12dB or more to increase the sensitivity level, and the size of the defect is determined with reference to the TCG curve.
In the above step S5, in the ultrasonic immersion C-scan detection system, the acoustic beam is focused to a defect point inside the sample to be detected, and the distance between the probe surface and the workpiece incident surface is set: d, d wp ＝F l -c tp /c 0 *d f Wherein d wp F is the distance between the probe surface and the sample incident surface l C is the nominal focal length of the probe tp C is the sound velocity (usually longitudinal wave sound velocity) of the detected sample 0 Is the sound velocity of longitudinal wave in water, d f To focus the distance of the target from the surface of the sample to be inspected.
In the above step S5, the gain amplification factor is gradually reduced so that the displayed defect spot size is reduced as much as possible.
In the step S6, the coordinates corresponding to the sample zero point position defect point O point and the sample internal defect point in the ultrasonic water immersion C scanning detection system are determined, the position of the sample internal defect point relative to the sample zero point position defect point O point is calculated, the defect position on the sample is marked by using a defect positioning ruler, and then the sample is dissected and the subsequent defect analysis is performed by wire cutting.
As shown in fig. 8, the defect positioning rule includes an angle measuring rule 5, an X-axis positioning rule 3, a diameter measuring rule 4 disposed on the angle measuring rule 5, a slider disposed on the diameter measuring rule 4, and a depth measuring rule 6 disposed on the slider, wherein the length direction of the X-axis positioning rule 3 is perpendicular to the length direction of the diameter measuring rule 4, one end of the X-axis positioning rule 3 in the length direction is fixedly connected with the slider, and the X-axis positioning rule 3 extends toward the outer side of the slider.
The angle measuring ruler 5 is of a disc-shaped structure, a circle of scale marks and corresponding scale numerical values are arranged on the surface of the angle measuring ruler 5, the angle measuring ruler 5 is arranged at the initial end of the sample in the axial direction, and the angle measuring ruler 5 and the sample are coaxial. When the angle measuring ruler 5 is used, the angle measuring ruler 5 is fixed on the initial end face of the sample in the axial direction, the angle measuring ruler 5 and the sample are kept in a coaxial state, the zero scale mark position on the angle measuring ruler 5 coincides with the marked 0-degree position on the end face of the sample, the angle value C of the defect in the sample relative to the defect point O of the zero position of the sample is calculated, and the angle value corresponding to the defect position is marked on the end face of the sample by rotating the diameter measuring ruler 4 through the angle measuring ruler 5.
The diameter measuring ruler 4 is rotationally connected with the angle measuring ruler at the center position of the angle measuring ruler, the length direction of the diameter measuring ruler 4 is perpendicular to the axis of the angle measuring ruler, scale marks and corresponding scale values are arranged on the surface of the diameter measuring ruler 4, the scale marks are distributed along the length direction of the diameter measuring ruler 4, and the length of the diameter measuring ruler 4 is larger than the diameter of a sample. In use, the diameter of the sample is measured by the diameter measuring scale 4.
The sliding block is sleeved on the diameter measuring ruler 4, the sliding block can move along the length direction of the diameter measuring ruler 4, and one end of the X-axis positioning ruler 3 is fixedly connected with the sliding block. The surface of the X-axis positioning ruler 3 is provided with scale marks and corresponding scale numerical values, and the scale marks are distributed along the length direction of the X-axis positioning ruler 3. When the device is used, the X-axis positioning ruler 3 is driven to move through the sliding slide block, and after the X-axis positioning ruler 3 moves to be in contact with the outer circular surface of the sample, the diameter of the sample can be measured according to the scale marks on the diameter measuring ruler 4 corresponding to the slide block. According to the calculated X-axis corresponding coordinates of the defect in the sample relative to the defect point O of the zero point position of the sample, the X-axis positioning ruler 3 is used for marking the X-axis position corresponding to the defect on the sample, and the X-axis is the axis of the sample.
One end of the depth measuring rule 6 in the length direction is rotationally connected with the sliding block, and the rotation center line of the depth measuring rule 6 is perpendicular to the length direction of the diameter measuring rule 4 and parallel to the length direction of the X-axis positioning rule 3. When the device is used, the depth measuring ruler 6 is used for marking the corresponding depth position of the defect on the end face of the sample according to the Z-axis corresponding coordinate of the defect point O point of the sample relative to the zero point position of the sample, and the Z-axis is perpendicular to the axis of the sample. The surface of the depth measuring scale 6 is provided with scale marks and corresponding scale values, the scale marks are distributed along the length direction of the depth measuring scale 6, and the zero scale mark position of the depth measuring scale 6 is positioned at the rotation center line of the depth measuring scale 6. During measurement, the depth measuring scale 6 is fixed on the diameter measuring scale 4, so that the scale surface of the depth measuring scale 6 coincides with the central axis of the diameter measuring scale 4, and the length direction of the depth measuring scale 6 is parallel to the length direction of the diameter measuring scale 4.
As shown in fig. 8, the defect positioning ruler further comprises a first adjusting knob 7 for fixing the diameter measuring ruler 4 on the angle measuring ruler 5 and a second adjusting knob 8 for fixing the depth measuring ruler 6 on the diameter measuring ruler 4. The first adjusting knob 7 is arranged at the center of the angle measuring ruler 5, the first adjusting knob 7 is in threaded connection with the angle measuring ruler 5, and a through hole for the first adjusting knob 7 to penetrate is formed in the end part of the diameter measuring ruler 4. By tightening the first adjustment knob 7, the first adjustment knob 7 compresses the diameter measuring scale 4, and the diameter measuring scale 4 can be fixed on the angle measuring scale 5. After unscrewing the first adjustment knob 7, the diameter measuring scale 4 can be turned. The second adjusting knob 8 is arranged on the sliding block, the second adjusting knob 8 is in threaded connection with the sliding block, and a through hole for the second adjusting knob 8 to pass through is formed in the end part of the depth measuring ruler 6. By tightening the second adjustment knob 8, the second adjustment knob 8 compresses the depth measuring scale 6, and the depth measuring scale 6 can be fixed on the diameter measuring scale 4. After unscrewing the second adjustment knob 8, the depth measuring scale 6 can be turned.
The defect ruler is simple in structure, convenient to operate, capable of accurately measuring the diameter of a sample and positioning the defect position (angle, depth and distance) of the sample, easy to master, high in practicality, and convenient to carry, and each functional ruler combined together can be disassembled.
Examples
The invention provides a method for ultrasonic water immersion flaw detection and defect positioning, which comprises the following steps:
s1, preparing a sample: the detection sample is steel for 18CrNiMo7-6 gear with the diameter of 80mm, the grain size of the sample after heat treatment is 8.5 grade (as shown in figure 2), and the surface roughness of the sample after the surface of the sample is processed by a lathe and a grinding machine is 0.476 mu m. Manufacturing a sample zero point position defect point O at a position 30mm away from the end of the sample;
s2, providing a standard sample block;
s3, manufacturing a TCG curve: preparing a distance-amplitude curve (DAC curve) by using a standard sample with the diameter of a flat bottom hole of 80mm and the diameter of 0.5mm, and compensating flat bottom Kong Fuzhi at different depths to 80% by depth compensation as shown in figure 3, and preparing an ultrasonic wave depth compensation curve, namely a TCG curve as shown in figure 4;
s4, scanning the sample: setting the scanning starting and ending positions of the system, placing the defect point O at the zero position of the sample in the scanning range of the system, setting the stepping distance and the scanning distance to be 0.05mm, and setting the stepping speed and the scanning speed to be 70mm/s. Pulse repetition frequency P RF =3.5 MHz, increasing the gain amplification factor to 18dB, the scan result is shown in fig. 6, and the size of the defect is determined with reference to the TCG curve;
s5, identifying defects in the sample: focusing the sound beam to the detected defect point, and respectively determining a defect point O point at the zero position of the sample and defect points A and B in the sample in a C scanning system;
s6, defect positioning in the sample: and determining corresponding coordinates of a sample zero point position defect point O and sample internal defect points A and B in an ultrasonic water immersion C scanning detection system, calculating the position of the sample internal defect relative to the sample zero point position defect point O, marking the defect position by using a defect positioning ruler, and obtaining a detailed position result shown in a table 1.
TABLE 1 defect O Point, A Point, B Point
| Position of | C scanning system corresponding coordinates (X, Y, Z, C) | Reference sample zero position correspondence mark (X, Z, C) |
| Point O of artificial defect | (128.03，70.95，-43.63，34.95°) | (0，0，0°) |
| Internal defect point A | (204.81，70.95，-58.78，9.86°) | (76.78，15.15，-25.09°) |
| Internal defect B point | (201.67.70.95.-57.51.111.92°) | (73.64.13.88.76.97°) |
S7, defect anatomy analysis: and performing linear cutting on the marked defect position on the sample, and performing targeted analysis on the defect information at the position.
The invention is described above by way of example with reference to the accompanying drawings. It will be clear that the invention is not limited to the embodiments described above. As long as various insubstantial improvements are made using the method concepts and technical solutions of the present invention; or the invention is not improved, and the conception and the technical scheme are directly applied to other occasions and are all within the protection scope of the invention.
Claims (10)
1. The ultrasonic water immersion flaw detection and defect positioning method is characterized by comprising the following steps:
s1, preparing a sample to be detected;
s2, providing a standard sample block;
s3, manufacturing a TCG curve;
s4, scanning the sample;
s5, identifying defects in the sample;
s6, positioning defects in the sample.
2. The method for ultrasonic water immersion flaw detection and defect localization according to claim 1, wherein in the step S1, the sample is a cylinder, the sample is subjected to surface processing after heat treatment, the roughness of the sample is not more than 1.0 μm, the grain size of the sample is better than 8 grades, and the surface processing amount of the sample is not more than 5% d.
3. The method for ultrasonic water immersion inspection and defect localization according to claim 2, wherein in the step S1, a detection start end of the sample is marked with a start position, including a start angle, a rotation direction, and a sample zero point position defect point O.
4. The method for ultrasonic water immersion flaw detection and defect positioning according to any one of claims 1 to 3, wherein in the step S3, a standard DAC detection curve is first fabricated according to the standard sample block, and then flat bottom Kong Fuzhi at different depths is compensated to 80% by depth compensation, so as to fabricate an ultrasonic depth compensation curve, i.e. a TCG curve.
5. The method for ultrasonic water immersion inspection detection and defect localization according to any one of claims 1 to 3, wherein in the step S4, the start and end positions of the system scanning are set, the defect point O of the zero point position of the sample is placed in the scanning range of the system, and the critical parameters of the scanning are set.
6. The method for ultrasonic water immersion inspection and defect localization of claim 5, wherein the scanning key parameters include step pitch, step speed and pulse repetition frequency; the step distance is more than or equal to 1/2L min ，L min Step pitch = scan pitch, which is the length of the smallest defect; the stepping speed is less than or equal to 100mm/s, and the stepping speed=scanning speed; pulse repetition frequency P RF = (scan speed/scan pitch) ×n, N is a positive integer.
7. Root of Chinese characterThe method for ultrasonic water immersion inspection and defect localization according to any one of claims 1 to 6, wherein in the step S5, the sound beam is focused to a defect point inside the inspected sample, and a distance between the probe surface and the workpiece incident surface is set: d, d wp ＝F l -c tp /c 0 *d f Wherein d wp F is the distance between the probe surface and the sample incident surface l C is the nominal focal length of the probe tp C is the sound velocity of the detected sample 0 Is the sound velocity of longitudinal wave in water, d f To focus the distance of the target from the surface of the sample to be inspected.
8. The method for ultrasonic water immersion flaw detection and defect localization according to any one of claims 1 to 6, wherein in the step S6, coordinates corresponding to the sample zero point position defect point O point and the sample internal defect point in the ultrasonic water immersion C-scan detection system are determined, the position of the sample internal defect point relative to the sample zero point position defect point O point is calculated, the defect position is marked by using a defect localization ruler, and then defect anatomy analysis is performed.
9. The method for ultrasonic water immersion inspection and defect positioning according to claim 8, wherein the defect positioning rule comprises an angle measuring rule, an X-axis positioning rule, a diameter measuring rule arranged on the angle measuring rule, a sliding block arranged on the diameter measuring rule and a depth measuring rule arranged on the sliding block, and the length direction of the X-axis positioning rule is perpendicular to the length direction of the diameter measuring rule.
10. The method of ultrasonic water immersion inspection and defect localization of claim 9, wherein the defect localization ruler further comprises a first adjustment knob that secures the diameter measurement ruler to the angle measurement ruler and a second adjustment knob that secures the depth measurement ruler to the diameter measurement ruler.
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